x86: string_32.h: workaround for broken gcc 4.0

gcc 4.0 fails to allocate %eax for the pattern operand in the rep
store instructions used by memset; force it to do so by declaring a
register variable.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/include/asm-x86/string_32.h b/include/asm-x86/string_32.h
index 8d0c593c4413..193578cd1fd9 100644
--- a/include/asm-x86/string_32.h
+++ b/include/asm-x86/string_32.h
@@ -267,11 +267,18 @@ void *__constant_c_and_count_memset(void *s, unsigned long pattern,
         asm volatile("rep ; stosl"                                      \
                      x                                                  \
                      : "=&c" (d0), "=&D" (d1)                           \
-                     : "a" (pattern), "0" (count/4), "1" ((long)s)      \
+                     : "a" (eax), "0" (count/4), "1" ((long)s)  \
                      : "memory")
 
         {
                 int d0, d1;
+#if __GNUC__ == 4 && __GNUC_MINOR__ == 0
+                /* Workaround for broken gcc 4.0 */
+                register unsigned long eax asm("%eax") = pattern;
+#else
+                unsigned long eax = pattern;
+#endif
+
                 switch (count % 4) {
                 case 0:
                         COMMON("");